Influence of HVOF spraying parameters on the wear resistance of Al-SiC composites coatings deposited on ZE41A magnesium alloy

摘要

High velocity oxygen fuel has been used as fabrication technique for manufacturing aluminium coatings reinforced with different weight percents of silicon carbide particles on Mg-Zn alloys used as substrates. The aim of the investigation is to improve the tribological performance of the ZE41A magnesium alloy. The parameters of the thermal projection system have been optimized in order to maximize the SiC particles incorporation in the aluminium matrix of the coating. Pin-on-disc tests were developed to characterize the tribological behavior of the different specimens. Minor degradation of the magnesium alloy was achived after. Composite coatings with thicknesses of about 120 μm, reinforced with about 10 wt.% and with high adhesion to the substrate were achived. Wear rate was decreased in two orders of magnitude after the optimization of the coating projection's parameters respect to that of the bare magnesium-alloy.